Ultralocalized optical heating method and device for carrying out same

Abstract

The invention relates to the field of nanotechnology, more particularly to exerting an ultralocalized thermal effect on an object under examination, and even more particularly to controlled heating using a nanodiamond heater. The present ultralocalized optical heating method is based on exposing to laser radiation nanoparticles fixed in the end of a glass capillary that is placed in a medium under examination. An ultralocalized optical heating device for carrying out this method comprises a nanoparticle disposed in a glass capillary that is mounted in a micromanipulator, wherein the nanoparticle is disposed in the end of the glass capillary and is a polycrystalline diamond particle containing amorphous carbon at its grain boundaries, which is optically coupled to a source of laser radiation and to a luminescence recording unit, wherein the diamond particle contains at least one luminescent impurity centre and the glass capillary is placed in a medium under examination.

1 . An ultralocal optical heating method based on an effect of a laser radiation on nanoparticles fixed in an end face of a glass capillary tube placed in a medium under study, wherein a polycrystalline diamond particle containing amorphous carbon at intercrystalline boundaries is placed in the glass capillary tube, a two-stage calibration of the diamond particle is carried out, at a first stage of calibration, the laser radiation is applied to the diamond nanoparticle fixed in a glass capillary tube and placed in a thermostat, and measurements are carried out to plot a curve of dependence of a spectral position of a maximum of a phononless luminescence line of impurity centers formed in the diamond particle on a set temperature, and at a second stage of calibration, the glass capillary tube with the diamond particle is placed in the medium under study, measurements are carried out to plot a curve of dependence of a heating temperature of the diamond particle on a laser radiation power, and after calibration, the glass capillary tube with the diamond particle is placed at a given point in the medium under study, and the diamond particle is exposed to the laser radiation with a power corresponding to a given temperature of ultralocal heating taking into account the calibration data. 
     
     
         2 . The method according to  claim 1 , wherein a metal layer with a thickness of no more than 20 nm is applied to a surface of the diamond particle. 
     
     
         3 . The method according to  claim 2 , wherein the metal layer is made of silver or gold or aluminum. 
     
     
         4 . The method according to  claim 1 , wherein the diamond particle is preheated to 900-1000° C. in vacuum for 5 to 30 minutes. 
     
     
         5 . The method according to  claim 1 , wherein the diamond particle is a diamond particle with a SiV center is selected. 
     
     
         6 . The method according to  claim 1 , wherein the diamond particle is selected with a nanometer size from 50 to 1000 nm. 
     
     
         7 . The method according to  claim 1 , wherein at the first stage of calibration, luminescence of SiV centers in the diamond particle is excited by the laser radiation with a wavelength of less than 738 nm and a power of less than 1 mW. 
     
     
         8 . The method according to  claim 1 , wherein at the second stage of calibration, luminescence of SiV centers in the diamond particle is excited by the laser radiation with a wavelength of less than 738 nm and a power of less than 1 mW. 
     
     
         9 . An ultralocal optical heating device for implementation of the method according to  claim 1 , containing a nanoparticle placed in the glass capillary tube mounted in a micromanipulator made with an ability of reciprocating movement of the glass capillary tube, a laser radiation system and a luminescence recording system, wherein the nanoparticle is the polycrystalline diamond particle containing amorphous carbon at intercrystalline boundaries, which is located at the end of the glass capillary tube and is optically connected to the laser radiation system and the luminescence detection system, while the diamond particle contains at least one luminescent impurity center, and the glass capillary tube is designed to be placed in the medium under study. 
     
     
         10 . The ultralocal optical heating device according to  claim 9 , wherein the laser radiation system contains an optically connected and sequentially mounted laser, a mirror, lens and a diaphragm connected to an optical fiber inserted into the glass capillary tube. 
     
     
         11 . The ultralocal optical heating device according to  claim 9 , wherein the luminescence recording system contains an optically connected and sequentially installed light filter, a diffraction grating, lens and a photodetector. 
     
     
         12 . The ultralocal optical heating device according to  claim 9 , wherein the micromanipulator is designed with the ability of reciprocating motion in three mutually perpendicular directions. 
     
     
         13 . The ultralocal optical heating device according to  claim 9 , wherein the diamond particle has a nanometer size from 50 to 1000 nm. 
     
     
         14 . The ultralocal optical heating device according to  claim 9 , wherein the glass capillary tube is made of borosilicate glass.